Timeshift-gui a GTK app and it is not scaled under KDE Plasma/Wayland. The fonts are small.
I can use the CLI version. However, if there is a way to scale the timeshift gui, it would be great,
Otherwise, is there a QT version of timeshift?
This might work:
GDK_DPI_SCALE=1.5 timeshift-gtk
The only way to get the KDE desktop to start timeshift scaled by 1.4 is to wrap it in bash script as follows:
#!/bin/bash
# file name: ~./local/bin/timeshift-hidpi.sh
sudo GDK_DPI_SCALE=1.4 timeshift-launcher